Mountcastle (foot) is not starting a rehab assignment Tuesday night as initially planned, and he is now being re-evaluated, Matt Weyrich of The Baltimore Sun reports.
The 29-year-old was expected to start a rehab assignment with Triple-A Norfolk on Tuesday after having progressed through his recovery from a left foot fracture at a steady rate. Manager Craig Albernaz said, "Mountcastle wasn't feeling 100 percent" and explained that "to start a rehab assignment not 100 percent is not where you want to be," Jake Rill of MLB.com reports. The Orioles will likely know more about Mountcastle on Wednesday.